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Topic Review
Unmet Goals of Pregnancy and Type 2 Diabetes
The increased frequency of type 2 diabetes worldwide has led to a concomitant increase in pregnancies complicated by type 2 diabetes This is mainly due to two factors: the earlier age of diabetes onset and the advanced age of pregnancy occurrence. Patients with type 2 diabetes in pregnancy show a high frequency of maternal and fetal complications, posing a series of problems in the follow-up of these women.
  • 357
  • 23 May 2023
Topic Review
Unmanned Systems
An Unmanned System (US) or Vehicle (UV) can be defined as an “electro-mechanical system, with no human operator aboard, that is able to exert its power to perform designed missions”
  • 9.4K
  • 17 Mar 2021
Topic Review
Unmanned Spaceflights to the International Space Station
Uncrewed spaceflights to the International Space Station (ISS) are made primarily to deliver cargo, however several Russian modules have also docked to the outpost following uncrewed launches. Resupply missions typically use the Russian Progress spacecraft, European Automated Transfer Vehicles, Japanese Kounotori vehicles, and the American Dragon and Cygnus spacecraft. The primary docking system for Progress spacecraft is the automated Kurs system, with the manual TORU system as a backup. ATVs also use Kurs, however they are not equipped with TORU. Progress and ATV can remain docked for up to six months. The other spacecraft — the Japanese HTV, the SpaceX Dragon and the Orbital Sciences Cygnus — rendezvous with the station before being grappled using Canadarm2 and berthed at the nadir port of the Harmony or Unity module for one to two months. As of September 2018, Progress spacecraft have flown most of the uncrewed missions to the ISS.
  • 468
  • 19 Oct 2022
Topic Review
Unmanned NASA Missions
Following is a sampling of some of NASA's past and present programs excluding manned spacecraft. The years in brackets are for first and latest launching. A program is a number of flights or missions with the same kind of spacecraft, therefore the name of the program and the name of the spacecraft used will often be the same. In all, NASA have made more than 1,000 unmanned missions into Earth orbit or beyond.
  • 1.0K
  • 23 Oct 2022
Topic Review
Unmanned Ground Vehicles
Unmanned ground vehicles (UGVs) have great potential in the application of both civilian and military fields, and have become the focus of research in many countries. Environmental perception technology is the foundation of UGVs, which is of great significance to achieve a safer and more efficient performance.
  • 3.0K
  • 22 Feb 2021
Topic Review
Unmanned Aircraft System Simulation
Unmanned aircraft system simulation focuses on training pilots (or operators) to control an unmanned aircraft or its payload from a control station. Flight simulation involves a device that artificially re-creates aircraft flight and the environment in which it flies for pilot training, design, or other purposes. It includes replicating the equations that govern how aircraft fly, how they react to applications of flight controls, the effects of other aircraft systems, and how the aircraft reacts to external factors such as air density, turbulence, wind shear, cloud, precipitation, etc. Manned simulation is used for a variety of reasons, including flight training (mainly of pilots), the design and development of the aircraft itself, and research into aircraft characteristics and control handling qualities. Unlike manned simulation, unmanned aircraft system (UAS) simulation does not involve a pilot aboard the training device.
  • 486
  • 21 Oct 2022
Topic Review
Unmanned Aircraft in Singapore
According to the Civil Aviation Authority of Singapore (CAAS), an unmanned aircraft (UA), commonly known as a drone, is operated without a pilot on board. An unmanned aircraft system (UAS) comprises the UA and associated elements such as the remote control equipment. Due to Singapore’s busy airspace and densely populated urban environment, the UA must be operated safely and responsibly to avoid risks to aviation and public safety. The CAAS requires operators to understand and abide by regulations, including recreational or research uses of the UA. More information on the regulations can be found on Air Navigation Order, paragraph 80.
  • 513
  • 11 Oct 2022
Topic Review
Unmanned Aerial Vehicles-Aided Internet of Things
With the surge of Internet of Things (IoT) applications using unmanned aerial vehicles (UAVs), there is a huge demand for an excellent complexity/power efficiency trade-off and channel fading resistance at the physical layer.
  • 761
  • 22 Sep 2022
Topic Review
Unmanned Aerial Vehicles in Precision Agriculture Sensing Applications
Precision agriculture (PA) is becoming highly significant in today’s technologically advanced world and has been considered as the farm for the future. This is a modern farming management concept using digital techniques to monitor and optimize agricultural production processes by using technological advancement. PA uses modern technology and principles to manage the spatial and temporal variability in all aspects of agricultural production for the goal of improving crop performance. 
  • 851
  • 01 Apr 2022
Topic Review
Unmanned Aerial Vehicles in Mine Closure/Rehabilitation Projects
Unmanned aerial vehicles (UAVs) are being used more frequently nowadays because of advancements in sensor and control technologies. They can use a range of single-band, multispectral, and hyperspectral sensors, including those that function in visible, infrared, and microwave spectrums. Their application in heritage and archaeological site mapping, transportation, civil engineering, agriculture, landscape mapping, wildlife conservation, infrastructure inspection, and search and rescue have been investigated in several studies.
  • 228
  • 06 Feb 2024
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